/*
 *  Copyright (c) 2001 Sun Microsystems, Inc.  All rights
 *  reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions
 *  are met:
 *
 *  1. Redistributions of source code must retain the above copyright
 *  notice, this list of conditions and the following disclaimer.
 *
 *  2. Redistributions in binary form must reproduce the above copyright
 *  notice, this list of conditions and the following disclaimer in
 *  the documentation and/or other materials provided with the
 *  distribution.
 *
 *  3. The end-user documentation included with the redistribution,
 *  if any, must include the following acknowledgment:
 *  "This product includes software developed by the
 *  Sun Microsystems, Inc. for Project JXTA."
 *  Alternately, this acknowledgment may appear in the software itself,
 *  if and wherever such third-party acknowledgments normally appear.
 *
 *  4. The names "Sun", "Sun Microsystems, Inc.", "JXTA" and "Project JXTA"
 *  must not be used to endorse or promote products derived from this
 *  software without prior written permission. For written
 *  permission, please contact Project JXTA at http://www.jxta.org.
 *
 *  5. Products derived from this software may not be called "JXTA",
 *  nor may "JXTA" appear in their name, without prior written
 *  permission of Sun.
 *
 *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 *  OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 *  DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 *  ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 *  USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 *  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 *  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 *  OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 *  SUCH DAMAGE.
 *  ====================================================================
 *
 *  This software consists of voluntary contributions made by many
 *  individuals on behalf of Project JXTA.  For more
 *  information on Project JXTA, please see
 *  <http://www.jxta.org/>.
 *
 *  This license is based on the BSD license adopted by the Apache Foundation.
 *
 *  $Id: ShareMonitor.java,v 1.1 2007/03/25 19:17:10 nano Exp $
 */

package net.jxta.myjxta.plugins.share;

import java.io.File;
import java.util.ArrayList;
import java.util.List;

/**
 *
 * @version $Id: ShareMonitor.java,v 1.1 2007/03/25 19:17:10 nano Exp $
 *
 * @author james todd [gonzo at jxta dot org]
 */

public final class ShareMonitor
extends Thread {
    
    /**
     * A class that unpublishes or republishes all
     * files in  given directory
     */
    static final class Publisher
    implements Runnable {        
        /** The ShareManager object to use */
        private final ShareManager manager;
        
        /** Are we sharing or unsharing the files */
        private final boolean sharing;
        
        /**
         * Create a new Publisher
         *
         *
         * @param manager the ShareManager object to use
         * @param sharing are we sharing or unsharing
         */
        protected Publisher(ShareManager manager, boolean sharing) {
            this.manager = manager;
            this.sharing = sharing;
        }
        
        public void run(){
            File files[] = this.manager.getShares().listFiles();
            int i;
            
            if (files != null) {
                for (i = 0; i < files.length ; i++) {
                    if (files[i].isFile()) {
                        if (sharing) {
                            this.manager.share(files[i], false);
                        } else {
                            this.manager.unshare(files[i], false);
                        }
                    }
                }
            }
            
        }
    }
    
    private ShareManager manager = null;
    
    /** The list of tasks we need to run */
    private final List<Publisher> taskList = new ArrayList<Publisher>();
    
    /** Are we currently running */
    private boolean running = true;
    
    /**
     * Create a new ShareMonitor
     */
    public ShareMonitor(ShareManager manager) {
        this.manager = manager;
        
        running = true;
       
        setName(getClass().getName());	
        setDaemon(true);

        start();
    }
    
    public void run() {
        Publisher publisher;
        
        while (running) {
            publisher = null;
            
            synchronized(taskList) {
                if (taskList.size() ==  0) {
                    try {
                        taskList.wait();
                    } catch(Exception iox){
                    }
                }
                
                if (taskList.size() > 0) {
                    publisher = taskList.get(0);
                    
                    taskList.remove(0);
                }
            }
            
            if (publisher != null) {
                publisher.run();
            }
        }
    }
    
    /**
     * Add a new task
     *
     * @param sharing are we sharing or unsharing
     */
    public void updateShares(boolean sharing){
        Publisher p = new Publisher(this.manager, sharing);
        
        synchronized(taskList){
            taskList.add(p);
            taskList.notifyAll();
        }
    }
    
    /**
     * Stop the running thread
     */
    public void stopThread() {
        running = false;
        interrupt();
    }   
}
